RFID: Read and Display
Contents
1. Cytron Technologie PRS RFID Read and Display Version 1 2 Aug 2008 Cytron Technologies Sdn Bhd Information contained in this publication regarding device applications and the like is intended through suggestion only and may be superseded by updates It is your responsibility to ensure that your application meets with your specifications No representation or warranty is given and no liability is assumed by Cytron Technologies Incorporated with respect to the accuracy or use of such information or infringement of patents or other intellectual property rights arising from such use or otherwise Use of Cytron Technologies s products as critical components in life support systems is not authorized except with express written approval by Cytron Technologies No licenses are conveyed implicitly or otherwise under any intellectual property rights OVERVIEW FEATURES This document describes the development of Cytron PIC16F876A Technologies DIY Do It Yourself Project No 8 PR8 bit microcontroller with 22 I O This project will use PICI6F876A and a RFID reader Operate with 5V supply IDR 232 to control LCD 2x 16 characters LED and Operating speed 20MHz buzzer Circuit schematic and PIC source code will be RFID reader IDR 232 provided RFID tag reader with serial UART output Operate with 5V supply Output baud rate 9600bps LCD 2x 16 characters 2x16 character display Operate with 5V supply Back light2. Plug in power supply for the circuit User can choose to use battery or AD to DC adaptor AC to DC adaptor C CONVERTER 5 TMC 500PM AC 220 260V TELETRON woe v i r Figure 17 Not included in DIY project set 9V battery connector Figure 18 not included in DIY project set Connection to the PCB board x Figure 19 8 Build the project and load the hex file into the PIC microcontroller using the USB In Circuit Programmer UICOOA When user build the project MPLAB IDE will generate hex file The hex file generated from MPLAB IDE will be named according to project name not C file name Cytron Technologies also provide hex file for user Do not forget to switch ON the power The programmer is not included in the hardware set but it can be found at Cytron website User manual is provided at website 9 Test the functionality of the PCB board 10 Modify the program ROBOT HEAD to TOE PR8 RFID Read and Display 11 Have fun TEST METHOD 1 Switch ON the power e Power Led Green will turn ON e LCD will show RFID door security e After a few second it will change to Place your ID on the reader 2 Place the card on RFID e LCDwillshow ID __ user not found e After afew second it will change again to Place your ID on the reader 3 Ifall steps mention above can be executed your project is done successfully Congratulations WARRANTY No warrant
3. 1s response time Operating frequency 125 KHz IDR 232 is fully working RFID tags reader and can be applied in Security system Car parking Office Hypermarket for item pricing Student projects IDR 232 can be connected to PC or microcontroller as part of embedded system In this project the reader will Created by Cytron Technologies Sdn Bhd All Rights Reserved 1 Cytron gt be interface to a microcontroller For more information please refer http www cytron com my datasheet IDR232 20Man ual 20v1 pdf How RFID works RFID also known as Radio frequency identification is an automatic identification method where the data is stored in the RFID tag The RFID reader is a device that transmit radio frequency when powered ON When the RFID tag is place near the RFID reader the RDIF tag will receive the radio frequency via the antenna inside RFID tag The radio frequency received will be converted into electrical power that is enough for the RFID tag to transmit the data back to the RFID reader Further the RFID reader will transmit the tag ID to PIC or PC via serial communication PIC16F876A This powerful 200 nanosecond instruction execution yet easy to program only 35 single word instructions CMOS FLASH based 8 bit microcontroller packs Microchip s powerful PIC architecture into an 28 pin package and is upwards compatible with the PIC16C5X PICI2CXXX and PICI6C7X devices Feature of the device
4. Bhd All Rights Reserved ROBOT HEAD to TOE PR8 RFID Read and Display Figure 6 is a 2x16 character LCD LCD connection pins and function of each pin Pin Name Pin function Connection _ 1 VSS Ground GND Pe ees aa a for LCD Brightness adjust Connected to a preset to adjust brightness 4 RS Select register select instruction or data register 5 R W Select read ori R write _ Oa aa a ae write 8 DBI Databuspin RBI 9 DB2 Databuspin RB2_ input negative input Figure 7 Power supply for the circuit Thode 1 DoT Power Dieseth D3 ug LMS VEC af 3 l J Figure 8 User can choose either AC to DC adaptor not included in the DIY project set or 9V 12V battery not included in the DIY project set to power up the circuit Higher input voltage will produce more heat at LM7805 Cytron gt voltage regulator Typical voltage is 12V Anyhow LM7805 will still generate some heat at 12V There are two types of power connector for the circuit DC plug J1 and 2510 02 Power Connector Normally AC to DC adaptor can be plugged to J1 type connector As Figure 8 shown the D2 is use to protect the circuit from wrong polarity supply C7 and C11 is use to stabilize the voltage at the input side of the LM7805 voltage regulator while the C8 and C12 is use to stabilize the voltage at the output side of the LM7805 voltage supply The LED is a green LED to indicate the power status of t
5. RB6 and RB7 need to be connected to the USB In Circuit Programmer UICOOA to program the PIC microcontroller At the same time RB3 need to be pull low to OV to disable low voltage programming because the programmer is using high voltage programming The programmer UICOOA is not included in DIY project set since it can be used several time for different project set User can also choose other type of PIC programmer to load the program For the instruction of using PIC programmer please refer to the particular PIC programmer user s manual Cytron 5 Technologie PCB circuit board Figure 13 Component L WE A a a 10 11 12 13 14 15 16 17 18 2510 02 connector to use either 9V battery or 12V battery to power up the circuit Slide switch to ON or OFF the circuit Buzzer LED Preset to adjust the brightness of the LCD LCD AC DC adaptor socket to use power supply from AC DC adaptor Diode to protect the circuit from wrong polarity power input Capacitor to stabilize the output voltage of the LM7805 voltage regulator Power indicator LED to indicate the power status of the circuit Crystal 2QOMHz PIC 16F876A the main brain of the system Push button LM7805 voltage regulator supply 5V for PIC Reset button to reset the microcontroller 2510 04 connector for RFID reader RFID reader support component ICSP box header to connect to PIC programmer for loa
6. may cause the circuit board fail to work S KN Warning Before the battery Power is plugged in make sure the polarity is correct to prevent the explosion Wrong polarity of capacitor also may cause explosion 2 Connect the RFID reader to 2510 04 connector Figure 15 Connect the wire to 2510 04 connector The heat shrink tube can be used to tie the wire together to make it look nicer The wire have to be soldered to the 2510 iron pin and plug the soldered iron P pin into 2510 04 connector according to the colour shown in Figure 15 and Figure 16 Figure 16 3 Please download the necessary files and document from Cytron Technologies website These included documentation sample source code schematic component list and software 4 The next step is to install MPLAB IDE and HI TECH C PRO into a computer The MPLAB IDE software can be downloaded from www cytron com my Please refer MPLAB IDE installation step document to install the software The documents can be used to any version of MPLAB IDE software 5 After the installation complete open the project file provided using MPLAB IDE Please refer MPLAB Open Project document to open the sample program ae 6 Please modify the tag ID in the program same as the tag ID that you want to read eae This step is to allow the system to remember Figure 14 the ID Created by Cytron Technologies Sdn Bhd All Rights Reserved 6 Cytron 5 7
7. Created by Cytron Technologies Sdn Bhd All Rights Reserved 1 Cytron Ytron SYSTEM OVERVIEW RFID tag RFID reader IDR 2372 ROBOT HEAD to TOE PR8 RFID Read and Display LCD 2x16 character Microcontroller PIC16F876A When the RFID tag is place near the RFID reader the RFID reader read the RFID tag further sends the tag ID to the PIC microcontroller PIC microcontroller process the tag ID the user name and the tag ID will be display on the LCD display GENERAL DESCRIPTION Cytron Technologies offers several model of RFID reader The most common and easy to use reader is DR 232 It read the RFID passive tag and sends the tag ID to PC or Microcontroller in serial communication RFID Reader IDR 232 Figure 1 Specification IDR 232 is plug and play RFID reader It has been designed with capabilities and features of e Low cost solution for reading passive RFID transponder tags e Industrial grade casing for better outlook and protection e Integrated RFID reader antenna LED power cable and data cable e Every reader has been tested before it being shipped e 9600 baud RS232 serial interface output only to PC Fully operation with 5VDC power supply Buzzer as sound indication of activity Bi color LED for visual indication of activity Standard RS232 serial cable female ready to plug to desktop PC or Laptop PS2 as power source from desktop PC 2cm reading range 0
8. ding program ROBOT HEAD to TOE PR8 RFID Read and Display SOFTWARE Flow Chart Initialize PIC and LCD Tag ID received Compare received tag ID with preprogram ID Tag ID match Yes Display Tag ID and user name not found Display Tag ID and user Beep once Beep twice For more information about the software of this system please refer to the source code provided The explanation of each instruction is provided in the source code as the comment of each line The source code is provided free and Cytron Technologies will not be responsible for any further modification or improvement GETTING START User can obtain the hardware set for this project PR8 either by online purchasing www cytron com my or purchase it in Cytron Technologies Shop 1 Once user has the hardware set soldering process can be started Please solder the electronic components one by one according the symbols or overlays on the Printed Circuit Board PCB Ensure the component value Created by Cytron Technologies Sdn Bhd All Rights Reserved 5 C yer on ROBOT HEAD to TOE Technologie PR8 RFID Read and Display and polarity is correctly soldered Please refer to PCB Layout in Appendix A Make sure all the connectors 2510 are soldered in proper side Those electronic A y f components have polarity such as capacitor Z AR 2 diode PIC LM7805 and LED should be soldered in right polarity or it
9. e 256 bytes of EEPROM data memory Self programming ICD In Circuit Debugging function 2 Comparators 5 channels of 10 bit Analog to Digital A D converter 2 capture compare PWM functions e The synchronous serial port can be configured as either 3 wire Serial Peripheral Interface SPI or the 2 wire Inter Integrated Circuit I2C bus e Universal Asynchronous Receiver Transmitter UART 28 Pin PDIP SOIC SSOP MCLRiver 1 i REVPGO REG PGC RES RB4 RBS PGM RB RET RBOMNT RANANIWVREF ICVREF _ RAJANANREF L RAA TOCKI CIOUT C RABIAN4 SSIC20UT L ooo oo on fe to ho OSC1 CLKI LJ OSc2 CLKO _ 10 RcoTIOSaTicK O11 RCITIOSICCP 12 Rc2ccP1 143 RCVSCKISCL J14 19 _ Vss 18 RCTIRX DT 17 RCSITXICK 16 RCSSDO 45 RCA4 SDI SDA PIC16F873A 876A Figure 2 Figure 2 shows the pin diagram for PIC16F876A For more information about the PIC microcontroller please refer to the datasheet The datasheet can be found in microchip web site at http www microchip com ROBOT HEAD to TOE PR8 RFID Read and Display HARDWARE This project will require following hardware 1 x RFID reader IDR 232 1 x PR8 Printed Circuit Board PCB 1 x PICI6F876A 1 x LCD 2x16 character Related electronic components ono o8 Please refer to Appendix A for the PCB layout of PR8 The PCB layout is provided free the
10. he circuit R13 is resistor to protect LED from over current that will burn the LED Push Button as input for PIC microcontroller RG 407 a i Button SW PB ii Figure 9 One I O pin is designated for a push button as input of PIC microcontroller The connection of the push button to the I O pin is shown in Figure 9 The I O pin should be pull up to 5V using a resistor with value range 1K 10K and this configuration will result an active low input When the button is being pressed reading of I O pin will be in logic 0 while when the button is not pressed reading of that I O pin will be logic 1 LED as output for PIC microcontroller DS3 4 TRE D w i 330 a LED T Figure 10 One I O pin is designated for a LED as output of PIC microcontroller The connection for a LED to I O pin is shown in Figurel0 The function of R11 is to protect the LED from over current that will burn the LED When the output is in logic 1 the LED will ON while when the output is in logic 0 the LED will OFF Created by Cytron Technologies Sdn Bhd All Rights Reserved ROBOT HEAD to TOE PR8 RFID Read and Display Buzzer as output of PIC microcontroller LS1 Buzzer Figure 11 When the output is in logic 1 the buzzer will activate beep while when the output is in logic O the buzzer will deactivate ICSP for microcontroller programming PIC R12 esl 10K Header 5X2 Figure 12 MCLR
11. refore Cytron Technologies will not be responsible for any further modification or improvement Interface RFID reader IDR 232 with PIC16F876A The RFID reader comes with a serial port DB9 for data communication and a PS2 connector to supply 5V for the reader For this project user has to cut the wire of the RFID reader and connect the wire to a 2510 04 female connector Different types of RFID reader sometimes have different color of output wire There are 5 output wire of RFID reader only 4 are necessary Figure 3 Figure 4 Created by Cytron Technologies Sdn Bhd All Rights Reserved J Cytron 5 Pin function Yellow Ra ves NC not connected NC Red Vee NC not connected Connect only four yellow green red and brown of the wire to 2510 04 female connector according to the colour of the wire For more information about how to connect the wire to 2510 04 connector please refer to getting start section Diode 1N4148 2510 04 Figure 5 The output of the RFID reader is serial UART in logic 10V 10V and the baud rate is 9600bps The Figure 5 shown is used to convert 10V 10V logic to 5V OV logic for PIC microcontroller Interface LCD 2x16 character with PIC16F876A To use the LCD user has to solder 16 header pin to the LCD LCD used in this project is JHD162A for other type of LCD please refer to its data sheet Figure 6 Created by Cytron Technologies Sdn
12. y will be provided as this is DIY project Thus user is advice to check the polarity of each electronic component before soldering it to board Appendix Created by Cytron Technologies Sdn Bhd All Rights Reserved T Cytron X Technologie PR8 RFID Read and Display PCB Layout C6 SW JWESC TOR e awa Created by Cytron Technologies Sdn Bhd All Rights Reserved gQ C yer on ROBOT HEAD to TOE Technologie PR8 RFID Read and Display Prepared by Cytron Technologies Sdn Bhd 19 Jalan Kebudayaan IA Taman Universiti 81300 Skudai Johor Malaysia Tel 607 521 3178 Fax 607 521 1861 URL www cytron com my Email support cytron com my sales cytron com my Created by Cytron Technologies Sdn Bhd All Rights Reserved 9
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